Pontoon: Update Serbian (sr) localization of Test Pilot Website
Pontoon: Update Serbian (sr) localization of Test Pilot Website

Localization authors:
- Zdravko Kosanović <zdravkokg@mail.ru>

mozilla/idea-town,meandavejustice/testpilot,mathjazz/testpilot,fzzzy/testpilot,meandavejustice/testpilot,fzzzy/testpilot,lmorchard/idea-town,meandavejustice/testpilot,mozilla/idea-town-server,meandavejustice/testpilot,chuckharmston/testpilot,mathjazz/testpilot,lmorchard/testpilot,lmorchard/idea-town,lmorchard/testpilot,mathjazz/testpilot,mozilla/idea-town,flodolo/testpilot,mozilla/idea-town,chuckharmston/testpilot,lmorchard/idea-town-server,mathjazz/testpilot,fzzzy/testpilot,chuckharmston/testpilot,mozilla/idea-town,mozilla/idea-town-server,lmorchard/idea-town,chuckharmston/testpilot,flodolo/testpilot,flodolo/testpilot,lmorchard/idea-town,lmorchard/idea-town-server,lmorchard/idea-town-server,lmorchard/testpilot,lmorchard/testpilot,lmorchard/idea-town-server,fzzzy/testpilot,flodolo/testpilot,mozilla/idea-town-server,mozilla/idea-town-server